Images were acquired over 90 sec with 180 projections (exposure time per projection: 500 msec; peak tube voltage: 45 kV; tube current: 177 µA) Using a syringe pump (Harvard Apparatus, Holliston, USA) Imeron 350 iodinated CT contrast (Byk Gulden, Konstanz, Germany) was continuously delivered at a rate of 200 µl/min throughout image acquisition as described elsewhere.
But the new I.B.M. system, known as Prevail, for Projection Reduction Exposure With Variable Axis Immersion Lenses, could represent an advance in throughput -- the speed at which silicon wafers can be processed.
Pseudopod projection after exposure to a step fluid shear occurs following a delay that is insensitive to the shear stress amplitude and duration.
Overall, in an unshielded environment, and for a posteroanterior (PA) projection, the exposure is greatest below the table, less at the operator's waist level, and least at the eye level.
Five exposures by projection (1767-millisecond exposure time) were used to produce high-contrast low-noise images.
In addition, the projections for exposure to fine particulates measured outdoors have some small margin of error.
Most explicitly, we based our future mortality projections on exposure-response slopes incorporating the most recent 10-year period of observed data (1997 2006) because of evidence these relationships have changed over time in our own results, consistent with results of other research (e.g., [ 9, 21, 24]).
During acquisition, 15 low-dose projection images with exposure parameters of 29 kVp and 44 mAs are obtained over a 15° arc with a continuous exposure method.
Our solution was to shoot two images of each fringe projection with different exposure values, resulting in a high dynamic range.
